CHEMICAL FAMILIES

Alkali metals. Atomic and ionic radii of alkali metals

By the end of the lesson, the learner should be able to:





Identify alkali metals.
State changes in atomic and ionic radii of alkali metals.

Q/A to reviews elements of group I and their electronic configuration.
Examine a table of elements, their symbols and atomic & ionic radii.
Discussion & making deductions from the table.

The periodic

K.L.B. BOOK IIPP 28-29

CHEMICAL FAMILIES

Ionisation energy of alkali metals.

By the end of the lesson, the learner should be able to:
State changes in number of energy levels and ionisation energy of alkali metals.

Examine a table of elements, number of energy levels and their ionization energy.
Discuss the trend deduced from the table.

text book

K.L.B. BOOK II

CHEMICAL FAMILIES

Physical properties of alkali metals.
Chemical properties of alkali metals.

By the end of the lesson, the learner should be able to:
State and explain trends in physical properties of alkali metals.
To describe reaction of alkali metals with water.

Examine a table showing comparative physical properties of Li, Na, and K.
Q/A: Teacher asks probing questions as students refer to the table for answers.
Detailed discussion on physical properties of alkali metals.


Q/A: Review reaction of metals with water.
Writing down chemical equations for the reactions.
Deduce and discuss the order of reactivity down the group.

Chart ? comparative properties of Li, Na, K.

text book

K.L.B. BOOK IIPP 30-31
K.L.B. BOOK IIP. 32

CHEMICAL FAMILIES

Reaction of alkali metals with chlorine gas.

By the end of the lesson, the learner should be able to:
To write balanced equations for reaction of alkali metals with chlorine gas.

Teacher demonstration- reaction of sodium with chlorine in a fume chamber.
Q/A: Students to predict a similar reaction between potassium and chlorine.
Word and balanced chemical equations for various reactions.

Sodium, chlorine.

K.L.B. BOOK IIP. 33

CHEMICAL FAMILIES

Reaction of alkali metals with chlorine gas.

By the end of the lesson, the learner should be able to:
To write balanced equations for reaction of alkali metals with chlorine gas.

Teacher demonstration- reaction of sodium with chlorine in a fume chamber.
Q/A: Students to predict a similar reaction between potassium and chlorine.
Word and balanced chemical equations for various reactions.

Sodium, chlorine.

K.L.B. BOOK IIP. 33

CHEMICAL FAMILIES

Compounds of alkali metals.
Uses of alkali metals.

By the end of the lesson, the learner should be able to:
Write chemical formulae for compounds of alkali metals.
Explain formation of hydroxides, oxides and chlorides of alkali metals.

State uses of alkali metals.

Exercise: Completing a table of hydroxides, oxides and chlorides of alkali metals.
Discuss combination of ions of alkali metals with anions.

Descriptive approach: Teacher elucidates uses of alkali metals.

text book

K.L.B. BOOK II pp 33
K.L.B. BOOK II pp 34

CHEMICAL FAMILIES

Alkaline Earth metals Atomic and ionic radii of alkaline earth metals.

By the end of the lesson, the learner should be able to:
Identify alkaline earth metals.

State changes in atomic and ionic radii of alkaline earth metals.

Q/A: Elements of group I and their electron configuration.
Examine a table of elements, their symbols and atomic & ionic radii.
Make deductions from the table.

Some alkaline earth metals.

K.L.B. BOOK II pp 34

CHEMICAL FAMILIES

Physical properties of alkaline earth metals.

By the end of the lesson, the learner should be able to:
State and explain trends in physical properties of alkaline earth metals.

Examine a table showing comparative physical properties of Be, Mg, Ca.
Q/A: Teacher asks probing questions as students refer to the table for answers.
Detailed discussion of physical properties of alkaline earth metals.

Some alkaline earth metals.

K.L.B. BOOK II P. 35

CHEMICAL FAMILIES

Electrical properties of alkaline earth metals.
Chemical properties of alkaline earth metals. Reaction of alkaline earth metals with oxygen.

By the end of the lesson, the learner should be able to:
To describe electrical properties of alkaline earth metals.
To describe reaction of alkaline earth metals with oxygen

Teacher demonstration: -
To show alkaline metals are good conductors of electric charge.
Q/A: Review reactions of Mg, Ca, with oxygen.
The corresponding word and then chemical equations are then written and their correctness verified by the teacher.

Alkaline earth metals.
text book

K.L.B. BOOK IIP. 37
K.L.B. BOOK IIP. 38

CHEMICAL FAMILIES

Chemical properties of alkaline earth metals. Reaction of alkaline earth metals with water.

By the end of the lesson, the learner should be able to:
To describe reaction of alkaline earth metals with water.

Q/A: Review reaction of metals with water.
Writing down word and balanced chemical equations for the reactions.
Deduce and discuss the order of reactivity down the group.

Some alkaline earth metals.

K.L.B. BOOK IIP. 39

CHEMICAL FAMILIES

Chemical properties of alkaline earth metals. Reaction of alkaline earth metals with water.

By the end of the lesson, the learner should be able to:
To describe reaction of alkaline earth metals with water.

Q/A: Review reaction of metals with water.
Writing down word and balanced chemical equations for the reactions.
Deduce and discuss the order of reactivity down the group.

Some alkaline earth metals.

K.L.B. BOOK IIP. 39

CHEMICAL FAMILIES

Reaction of alkaline earth metals with chlorine gas.
Reaction of alkaline earth metals with dilute acids.

By the end of the lesson, the learner should be able to:
To write balanced equations for reaction of alkaline earth metals with chlorine gas.
To write balanced equations for reactions of alkaline earth metals with dilute acids.

Teacher demonstration- Reaction of sodium with chlorine in a fume chamber.
Q/A: Students to predict a similar reaction between potassium and chlorine.
Word and balanced chemical equations for various reactions.
Supervised practice.

Changing word to chemical equations.
Supervised practice.

Sodium, chlorine.
revision book

K.L.B. BOOK II P. 41
K.L.B. BOOK II PP. 43

CHEMICAL FAMILIES

Chemical formulae of alkaline earth metals.

By the end of the lesson, the learner should be able to:
Write chemical formulae for compounds of alkaline earth metals.
Explain formation of hydroxides, oxides and chlorides of alkaline earth metals.

Exercise: Completing a table of hydroxides, oxides and chlorides of alkaline earth metals.
Discuss combination of ions of alkaline earth metals with anions.

text book

K.L.B. BOOK II PP. 45-47

CHEMICAL FAMILIES

Uses of some alkaline earth metals and their compounds.

By the end of the lesson, the learner should be able to:
State uses of alkaline earth metals.

Descriptive approach: Teacher elucidates uses of alkaline earth metals.

text book

K.L.B. BOOK II PP. 45-47

CHEMICAL FAMILIES

Halogens. Physical properties of halogens.
Comparative physical properties of halogens.
Chemical properties of halogens.

By the end of the lesson, the learner should be able to:
Identify halogens in the periodic table.
Give examples of halogens.
Identify physical states of halogens.

To describe laboratory preparation of chlorine gas.

To describe reaction of halogens with metals.

Teacher demonstration: - To examine electrical properties of iodine, solubility in water of chlorine.
Teacher demonstration: - preparation of chlorine gas.
Reaction of chlorine and iron wool.
Reaction of bromine and iron wool.
Reaction of iodine and iron wool.
Observe the rate of these reactions; hence deduce order of their reactivity of halogens.

Iodine crystals, electrical wire, a bulb.
text book
Chlorine, iron wool, bromine.

KLB BK II
P. 47
K.L.B. BOOK IIPP. 48-50

CHEMICAL FAMILIES

Equations of reaction of halogens with metals.

By the end of the lesson, the learner should be able to:
To write balanced chemical equations of reactions involving halogens.

Re-write word equations as chemical equations then balance them.
Supervised practice.

text book

K.L.B. BOOK II P. 50

CHEMICAL FAMILIES

Reaction of halogens with water.

By the end of the lesson, the learner should be able to:
To describe reaction of halogens with water and the results obtained.

Bubbling chlorine gas through water.
Carry out litmus test for the water.
Explain the observations.

Chlorine gas, litmus papers.

K.L.B. BOOK II P. 51

CHEMICAL FAMILIES
CHEMICAL FAMILIES
STRUCTURE & BONDING

Some uses of halogens and their compounds.
Noble Gases. Comparative physical properties of noble gases.
Uses of noble gases.
Chemical bonds. Ionic bond.

By the end of the lesson, the learner should be able to:
To state uses of halogens and their compounds.
To describe physical properties of noble gases.
To explain physical properties of noble gases.

Teacher elucidates uses of halogens and their compounds.
Make A comparative analysis of tabulated physical properties of noble gases.

text book

K.L.B. BOOK II pp 52
  K.L.B. BOOK IIPP. 52-53

STRUCTURE & BONDING

Ionic bond representation.
Grant ionic structures.

By the end of the lesson, the learner should be able to:
Use dot and cross diagrams to represent ionic bonding.

Drawing diagrams of ionic bonds.

Chart- dot and cross diagrams.
Models for bonding.
Giant sodium chloride model.

K.L.B. BOOK II P. 58

STRUCTURE & BONDING

Physical properties of ionic compounds.
Covalent bond.

By the end of the lesson, the learner should be able to:
Describe physical properties of ionic compounds.
Explain the differences in the physical properties of ionic compounds.

Analyse tabulated comparative physical properties of ionic compounds.

Teacher asks probing questions.

text book

K.L.B. BOOK IIPP 58-59

STRUCTURE & BONDING

Co-ordinate bond.
Molecular structure.
Trend in physical properties of molecular structures.
Giant atomic structure in diamond.

By the end of the lesson, the learner should be able to:
To describe the co-ordinate bond
To represent co-ordinate bond diagrammatically.
To describe van- der -waals forces.
To explain the trend in physical properties of molecular structures.

Exposition- teacher explains the nature of co-ordinate bond.
Students represent co-ordinate bond diagrammatically.
Discuss comparative physical properties of substances. exhibiting molecular structure.
Explain variation in the physical properties.

text book
Sugar, naphthalene, iodine rhombic sulphur.
Diagrams in textbooks.

K.L.B. BOOK II P 65
K.L.B. BOOK IIP 65

STRUCTURE & BONDING

Giant atomic structure in graphite.
Metallic bond. Uses of some metals.

By the end of the lesson, the learner should be able to:
To describe giant atomic structure in graphite.
To state uses of graphite.

Diagrammatic representation of graphite.

Discuss uses of graphite.

Diagrams in textbooks.
text book

K.L.B. BOOK II pp 69

PROPERTIES AND TRENDS ACROSS PERIOD THREE

Physical properties of elements in periods.

By the end of the lesson, the learner should be able to:




To compare electrical conductivity of elements in period 3

Group experiments- Construct electrical circuits incorporating a magnesium ribbon, then aluminum foil, then sulphur in turns.
The brightness of the bulb is noted in each case.
Discuss the observations in terms of delocalised electrons.

The periodic table.

K.L.B. BOOK IIP. 76

PROPERTIES AND TRENDS ACROSS PERIOD THREE

Physical properties of elements in period 3.
Chemical properties of elements in period 3.
Chemical properties of elements in the third period.
Oxides of period 3 elements.

By the end of the lesson, the learner should be able to:
To compare other physical properties of elements across period 3.
To compare reactions of elements in period 3 with water

Analyse comparative physical properties presented in form of a table.
Explain the trend in the physical properties given.

Q/A: Review reaction of sodium, Mg, chlorine, with water.
Infer that sodium is most reactive metal; non-metals do not react with water.

The periodic table.

K.L.B. BOOK II P. 77
K.L.B. BOOK II PP. 80-81

PROPERTIES AND TRENDS ACROSS PERIOD THREE
SALTS

Chlorides of period 3 elements.
Types of salts.

By the end of the lesson, the learner should be able to:
To explain chemical behavior of their chlorides.
To describe hydrolysis reaction.

Comparative analysis, discussion and explanation.

The periodic table.
text book

K.L.B. BOOK II PP. 77-78

SALTS

Solubility of salts in water.

By the end of the lesson, the learner should be able to:
To test solubility of various salts in cold water/warm water.

Class experiments- Dissolve salts in 5 cc of water.
Record the solubility in a table,
Analyse the results.

Sulphates, chlorides, nitrates, carbonates of various metals.

K.L.B. BOOK II PP. 92-93

SALTS

Solubility of bases in water.
Methods of preparing various salts.

By the end of the lesson, the learner should be able to:
To test solubility of various bases in water.
To carry out litmus test on the resulting solutions.
To describe various methods of preparing some salts.

Class experiments- Dissolve salts in 5cc of water.
Record the solubility in a table,
Carry out litmus tests.
Discuss the results.


Experimental and descriptive treatments of preparation of salts e.g. ZnSO4, CuSO4, NaCl and Pb(NO3)2.

Oxides, hydroxides, of various metals, litmus papers.
CuO, H2SO4, HCl, NaOH, PbCO3, dil HNO3.

K.L.B. BOOK IIPP. 94-95
K.L.B. BOOK II pp96

SALTS

Direct synthesis of a salts.
Ionic equations.

By the end of the lesson, the learner should be able to:
To describe direct synthesis of a salt.
To write balanced equations for the reactions.

Group experiments- preparation of iron (II) sulphide by direct synthesis.
Give other examples of salts prepared by direct synthesis.
Students write down corresponding balanced equations.

Iron,
Sulphur
PbNO3, MgSO4 solutions.

K.L.B. BOOK II P. 104

SALTS

Effects of heat on carbonates.
Effects of heat on nitrates.

By the end of the lesson, the learner should be able to:
To state effects of heat on carbonates.
To predict products resulting from heating metal carbonates.

Group experiments- To investigate effects of heat on Na2CO3, K2CO3, CaCO3, ZnCO3, PbCO3, e.t.c.
Observe various colour changes before, during and after heating.
Write equations for the reactions.

Various carbonates.
Common metal nitrates.

K.L.B. BOOK II PP. 108-109

SALTS

Effects of heat on sulphates.
Hygroscopy, Deliquescence and Efflorescence.
Uses of salts.

By the end of the lesson, the learner should be able to:
To state effects of heat on sulphates.
To predict products results from heating metal sulphates.
To state uses of salts

Group experiments- To investigate effects of heat on various sulphates.
Observe various colour changes before, during and after heating.
Write equations for the reactions.

Teacher elucidates uses of salts.

Common sulphates.

K.L.B. BOOK II P. 113
K.L.B. BOOK II P. 114